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4 configure port mirroring, On 4.2.1.4) – Contemporary Control Systems Compact Managed Switches Software Manual for Console Access User Manual

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TD020850-0MG

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4.3.4 Configure Port Mirroring

Port mirroring allows one port to copy or “mirror” all traffic transmitted or received by

one or multiple ports. This is useful when an Ethernet diagnostic tool is used. Switches

generally transmit frames only to the ports involved in the conversation, therefore port

mirroring is required if a diagnostic tool needs to capture network traffic. The

Configure

Port Mirroring menus allow various adjustments to how data is mirrored, but they apply

only if the

Status option is Enabled.

The

Mirror Port is the one to which data is copied. Ingress Mirroring Rules apply to

data received by the ports being mirrored. The example in Figure 9 (for an 8-port

switch) has Port 1 defined as the mirror.

Source Ports (those having their data copied)

are shown by a “Y” and Figure 9 depicts Ports 2 and 3 chosen as source ports.
The

Divider value specifies the fraction of messages sent by each port. For example, a

Divider value of 7 will send every seventh message to the mirror port, while a value of 1

(as in Figure 9) will send each message to the mirror port.
The

MAC Address options are :

All — mirrors all traffic regardless of MAC address. This is the default. Since no

addressing is used, a

Source/Destination Addr line will not appear.

If either of the following options are chosen, a

Source/Destination Addr line will

appear beneath the

MAC Address line.

Source — mirrors only messages whose source addresses match the

MAC Address entered by the user in the

Source Addr below.

Destination — mirrors only messages whose destination addresses match

the MAC Address entered by the user in the

Destination Addr below.

Figure 9Configure Port Mirroring Ingress Rules

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